Hydraulic back rest for grinding machines



May 21, 1929. A. P. STEINER HYDRAULIC BACK BEST FOR GRINDING MACHINESFiled July 29, 1926 5 Sheets-Sheet IN VEN TOR )1 mas. 1? 66667167,:

(I AT RNEY.

y 1929- A. STEINER 1,713,722

HYDRAULIC BACK REST FOR GRINDING MACHINES Filed July 29, 1926 5Sheets-Sheet 2 INVENTOR. Amos. P. Qfiteinezr BY W ATT NEY.

May 21, 1929. A. P. STEINER HYDRAULIC BACK REST FOR GRINDING MACHINESFiled July 29, 1926 5 Sheets-Sheet 5 I i l l l l l 1 l 4 l l I I l I l iIN VEN TOR Amos. P. 6160mm 1 AT ORNEY.

Patented May 21, 1929. v

UNITED STATES PATENT OFFICE.

AMOS 1P. STEINER, OF WAYNESBORO. PENNSYLVANIA, ASSIGNOR TO LANDIS IOOLCOMPANY, OF WAYNESBORO, PENNSYLVANIA, A CORPORATION OF PENNSYL- VANIA.

HYDRAULIC BEST FOR GRINDING MACHINES.

' Application filed July 29,

My said invention relates to a hydraulic back-rest for use on a machinefor turning or grinding shafting particularly automobile crank shaftsand it is an object of the same 5 to provide means whereby the skill andattention formerly required of an operator to keep the shaft properlysupported with the hand operated back-rest is transferred to thismechanism which performs the same operation hydraulically.

A further object is to provide means whereby the bearing block of thedevice can be withdrawn to a position outside the path of rotation ofany art of a crank shaft.

A further ob ect is to provide means for adjusting the movement of thebearing block in order to take up wear on said block or to provide forshafts or different-diameters.

A further object is to provide means to prevent rotation of the pistonand hence of the bearing block about the axis of said piston.

A further object is to provide means whereby the bearing block may bereplaced to fit shafts of different diameters.

Referring to the accompanying drawings which are made a part hereof andon which similar reference characters indicate similar parts,

Figure 1 is an end elevation of the device with the cylinder in section,

Figure 2, a front elevation thereof,

Figure 3, an end elevation similar to Figure 1 but showing'the pipingconnections,

Figure 4, a front elevation showing the water guard in place and a crankshaft in position for grinding, and

Figure 5, a front elevation on a plane perpendicular to the axis of thecylinder.

40 Figure 6 is a detail sectional view of the cylinder piston andretracting 3 ring.

In the drawing, the numeral 10 enotes the bed or base of a cylindricalgrinding machine, 11 is the carriage, 12 the work, which,

45 as illustrated in this instance is a crank shaft, and W the grindingwheel. The back-rest comprises a casting 13 having formed therein acylinder 14. The lower end of the casting 13 is secured to the bed 10 bybolts 15 50 while the upper end is flanged to support a water guard 16secured thereto by bolts 17.

The cylinder 14 is lined with a bushing 18 1926. Serial No. 125,782.

held from displacement by a pin 19 and closed at the outer end by a head20. A piston rod 21 passes through the cylinder and beyond both endsthereof and has fixed thereto a piston 22 provided with a groove 23adapted to receive packing 24 held under pressure by means of a washerand nut 25 to prevent any leakage of the pressure fluid past saidpiston. The inner end of the rod 21 is slotted as at 26 and providedwith dove-tailed jaws 27 adapted to receive the dove-tailed end of abearing block 28 secured therein by a bolt 29 which passes through thejaws 27. In order to prevent any water from entering the piston chamber,a packing box 30 is provided where the rod 21 enters the casting 13. Theouter end of the rod 21 passes through a packing box 31 in the head 20and is threaded at 32 to receive a calibrated adjusting nut 33 which isused to adjust the rod 21 to compensate for any wear on the bearingblock 28 or to vary the inward movement of the rod 21 to provide fordifferent sizes of work. 1n Figure 1, of the drawings, the piston isshow. in its working position or under pressure of the pressure fluid.When the pressure fluid is shut off, the piston and its associated partsare moved away from the work by means of springs 34 and 35 mounted in achamber 36 communicating with the cylinder 14. The spring 34 bears atone end against the piston 22 and at the other end against an inturnedflange 37 of a sleeve 38 which surrounds said spring and which has anout-turned flange 39 at its opposite end against which one end of thespring 35 bears. The other end of spring 35 rests against a shoulder 40formed by the end of thechamber 36. With this arrangement of springs,the piston is moved twice the distance attainable with a single springof the same length.

In order to prevent rotation of the piston rod 21 on its axis, an arm 41is keyed to the outer end thereof with its opposite end keyed to a shaft42 slidably mounted in a bore 43 in the casting 13 and parallel with therod 21.

Fluid under pressure is conducted from a pipe 44 through a three-wayvalve 45 and short pipe 46 to the cylinder 14 for operating the piston22 and forc ng the block 28 against the work. When it is desired towithdraw the block 28 from the work, the valve 45 is vice withoutdeparting from the spirit of the,

invention and therefore I do not limit myself to what is shown in thedrawings and described ;in' thespecification but only as indin' ,catedinithe appended claims -Having thus fully described my said invention,whatl claim as new and desire to secure by Letters Patent, is Y 1. Ahydraulic back-rest of the class described comprising a bracket, acylinder constru cted integral therewith, a piston and piston rod insaid cylinder, a bearing block-on the end of said rod,.fluid-pressuremeans to force said piston 'and block in one direction, and resilientmechanical means for retracting said block, substantially as set forth.

2. A hydraulic back-rest of the class described comprising a bracket, acylinder constructed integral therewith, a piston and piston rod in saidcylinder, a bearingblock on the end of said rod, and means to preventrotation of said rod comprising an arm fixed at one end to said pistonrod, a short rod fixed to the otherend of said arm and a passage in saidbracket parallel to said piston rod to receive said short rod,substantially as set forth.

3. A hydraulic backrest of the class described comprising a bracket, acylinder associated therewith, a piston and piston rod in said cylinder,a bearing block on the end of said rod, fluid-pressure means to forcesaid piston and block in one direction, and me chanical means to forcesaid piston and block in the other direction comprising a springencircling said piston rod and bearing at One end against said piston, asleeve encircling said spring, an inwardly extending flange on one endof said sleeve supporting the other end of said spring, an outwardlyextending flange on the opposite end of said sleeve, and a second springbearing against said outwardly extending flange and said bracket,substantially as set forth.

l. A hydraulic back-rest of the class described comprising a bracketrigidly attached to a stationary part of the grinding machine, acylinder constructed integral with the bracket, a piston and a pistonrod in said cylinder, a bearing block on the end of said rod, means foradmitting pressure fluid to one end of said cylinder, to move the pistonin the direction of the work, and resilient means for withdrawing thepiston from the work, substantially as set forth.

In witness whereof, I have hereunto set my hand at VVaynesboro,Pennsylvania this 26th day of July, A. D. nineteen hundred andtwenty-six. e

AMOS P. STEI NER.

